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Accumulated Other Comprehensive Loss - Amounts Reclassified (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Employee benefit costs:            
Miscellaneous expense, net $ (3,587)   $ (3,559)   $ (7,145) $ (7,091)
Income tax benefit 6,595   1,248   11,921 12,685
Net loss (12,252) $ (11,032) (4,954) $ (33,947) (23,284) (38,901)
Amounts reclassified from accumulated other comprehensive loss | Amortization of net actuarial loss            
Employee benefit costs:            
Miscellaneous expense, net 2,163   1,432   4,382 2,822
Amounts reclassified from accumulated other comprehensive loss | Employee benefit costs            
Employee benefit costs:            
Income tax benefit (471)   (312)   (955) (615)
Net loss $ 1,692   $ 1,120   $ 3,427 $ 2,207